/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Public/IOpenXRExtensionPlugin.h
Method to add an anchor on tracking space
bool OnPinComponent ( class [UARPin](API\Runtime\AugmentedReality\UARPin) * Pin, XrSession InSession, XrSpace TrackingSpace, XrTime DisplayTime, float worldToMeterScale )